Auto merge of #2636 - JohnTitor:comrak, r=jtgeibel

Update comrak to 0.8 since 0.7.1 is yanked

0.7.1 is yanked as it contained a breaking change that we addressed here a while ago.
See: https://github.com/kivikakk/comrak/blob/master/changelog.txt

r? @jtgeibel

Author: bors

Cargo.lock

@@ -52,7 +52,7 @@ swirl = { git = "https://github.com/sgrif/swirl.git", rev = "e87cf37" }
 serde_json = "1.0.0"
 serde = { version = "1.0.0", features = ["derive"] }
 chrono = { version = "0.4.0", features = ["serde"] }
-comrak = { version = "0.7", default-features = false }
+comrak = { version = "0.8", default-features = false }
 ammonia = "3.0.0"
 docopt = "1.0"
 scheduled-thread-pool = "0.2.0"